'use strict';

const { test } = require('ava');
const ClientMetricStore = require('./client-metrics-store');
const sinon = require('sinon');

function getMockDb () {
    const list = [{ id: 4, metrics: {appName: 'test'} }, { id: 3, metrics: {appName: 'test'} }, { id: 2, metrics: {appName: 'test'} }];
    return {
        getMetricsLastHour () {
            return Promise.resolve([{ id: 1, metrics: {appName: 'test'} }]);
        },

        getNewMetrics (v) {
            return Promise.resolve([list.pop() || { id: 0 }]);
        }
    };
}


test.cb('should call database on startup', (t) => {
    const mock = getMockDb();

    const store = new ClientMetricStore(mock);
    
    t.plan(2);


    store.on('metrics', (metrics) => {
        t.true(store.highestIdSeen === 1);
        t.true(metrics.appName === 'test');
        store.destroy();
        
        t.end();
    });
});


test.cb('should poll for updates', (t) => {
    const clock = sinon.useFakeTimers();

    const mock = getMockDb();
    const store = new ClientMetricStore(mock, 100);

    const metrics = [];
    store.on('metrics', (m) => metrics.push(m));

    t.true(metrics.length === 0);

    store.on('ready', () => {
        t.true(metrics.length === 1);
        clock.tick(300);
        process.nextTick(() => {
            t.true(metrics.length === 4);
            t.true(store.highestIdSeen === 4);
            store.destroy();
            clock.restore();
            t.end();
        });
    });
});